import java.util.Scanner;
public class Circle {
    double centerx;
    double centery;
    double radious;
    public Circle(){
        this(1.0);
    }
    public Circle(double radious){
        this.radious = radious;
    }

    public double getRadious() {
        return radious;
    }

    public void setRadious(double radious) {
        this.radious = radious;
    }

    public double getArea(){
        double area = 3.14*radious*radious;
        return area;

    }
    public double getPerimeter(){
        double perimeter = 2*3.14*radious;
        return perimeter;
    }
    public static void main(String[] arg){
        Circle c = new Circle();
        System.out.println(c.getRadious());
        c.setRadious(10);
        System.out.println(c.getArea());
        System.out.println(c.getPerimeter());

    }

}
